By Pan Jiluan
Written through a pioneer within the box, this publication covers all elements of the rising know-how of arc welding. Part one quantitatively describes the dynamic habit of arc welding, the ability resources used, and their impression on welding expertise throughout the foundation of keep watch over theory. The moment part describes new methods of controlling the welding arc via sleek electronics. the following sections establish the 1st mathematical version of the arc sensor at the foundation of keep an eye on thought and introduce a brand new process for measuring weldment temperature fields utilizing the colorimetric-imaging procedure. The 5th and final section explains the assumption of spotting weld grooves with a third-dimensional imaginative and prescient process and automated programming of the weld direction.
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Extra resources for Arc welding control (Series in Welding and Other Joining Technologies)
In order to simplify the equation, some minor factors can be neglected. 20 Schematic diagram of amplitude-frequency characteristics for a transistorised power source with a flat power-source characteristic From the simplified equation, it can be seen that the power source is equivalent to a first-order system with one zero; the amplification coefficient is -bK/(bR + R1 + R2), the value of zero is s0 = -bKR3/[(R1 + R2)(Tc + Tb)] and the value of the pole is sp = -(bR + R1 + R2)/[(R1 + R2)Tb + bKRT].
15 Amplitude-frequency characteristics of a welding generator (Asymptote) From the derived equation, it can be seen that the transfer function of a generator-type power source is a Type 2 control system with one zero. The static-amplification coefficient is -1/(Kc + R) and the time constant depends on the configuration. e. w1 < w2. Therefore, the amplitude-frequency characteristics can be depicted as shown in Fig. 15. In the following paragraphs, the transfer function of the welding generator under two special conditions is discussed.
35] In most instances, k2KmpkaTm > 1 and 0 < z < 1; therefore the system is in an underdamped state. In the following sections, the effects of the major parameters on the control characteristics are discussed. 1 Effect of wire-feed mechanism The dynamic-characteristics parameters z, wn, wd, and s depend on the time constant of the wire-feed mechanism, Tm. The greater the value of Tm, the smaller the damping factor z will be, and the greater the overshoot; the system is likely to oscillate. Additional increase of Tm makes wn, wd and s smaller and the transient time longer, and thus worsens the dynamic characteristics.
Arc welding control (Series in Welding and Other Joining Technologies) by Pan Jiluan